Finding the Fourth Proportional to 51,230.79, 70,698.15 and 28,570.05

Step by Step Solution

1. Step 1: Write the proportion equation
   51,230.79 : 70,698.15 = 28,570.05 : x
2. Step 2: Convert to fraction form
   51,230.79/70,698.15 = 28,570.05/x
3. Step 3: Cross multiply
   51,230.79x = 70,698.15 × 28,570.05
4. Step 4: Simplify right side
   51,230.79x = 2,019,849,680.41
5. Step 5: Solve for x
   x = 2,019,849,680.41/51,230.79
6. Step 6: Final answer
   x = 39,426.48